Abstract: Ecotone positions on the east and west slopes of Mt. Huoshan, Shanxi Province were identified by calculating edge effects of different sampling regions located at one hundred meters (altitude) intervals. A quantitative division of vegetation types was achieved using these identified ecotones and a cluster analysis of biotypes. The vegetation of the warm temperate broad-leaved forest in Mt. Huoshan in Shanxi Province was subsequently divided into five vegetation altitudinal belts and three subbelts.